CAP theorem: you can only have 2 of 3 — Consistency (all nodes see same data), Availability (every request gets a response), Partition tolerance (system works despite network failures). Since partitions happen, you choose CP or AP.

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High-Level Design0/247

Heartbeats

Consensus Algorithms

Leader Election

Distributed Transactions

Gossip Protocol

Two-phase Commit Protocol

Three-phase Commit (3PC)

Vector Clocks

CRDTs

Handling Failures in Distributed Systems

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hardPhase 14 · Distributed Systems 5 min read

Leader Election

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Interactive — Try it yourself!

How to use

1Click "Write to Node A" — see data propagate to B and C

2Hit "Partition" — network between nodes breaks!

3Try writing again: CP mode rejects writes (consistent but unavailable)

4Switch to AP mode: writes succeed but nodes have different data

5Click "Heal Partition" to restore

In a nutshell

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